Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7de5218f1057c03…

MALICIOUS

PDF

89.1 KB Created: 2021-08-16 10:41:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7f6c52213f3cf48218791f8de45cb1e4 SHA-1: 8d143369aa4f088c405d2e1ff785de7ebff66203 SHA-256: d7de5218f1057c038561d3df44d40d872ae6b5f8a3cbbcc6b987dd4974e4555e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://jjinline.org/file_upload/file/34656693564.pdf In PDF document text
    • https://heatingboiler.ca/fck_upload/file/zufubevufapujubomuwevuxat.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608300f93bd41---dosemodizilise.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/97119357577.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f180731dfa---jujixenuzixivudena.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/29ad4642cceeefd8b662131be9f01d42/kikenodu.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/49574464331.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/lufebugiz.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/novuselofisowafujanova.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b47c150c6f5---mevumajigatu.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/1f6b28221bf8e67ff330e965b609ad38/kumima.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/tejanupizabumuxodeg.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/39087764841.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/13129634426.pdfIn PDF document text
    • https://webmenuplus.com/images/file/71800294567.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/63514792047.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/d3f249027dc96f74b86c81dcc4ad63ea/95073336712.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/93eeecd50d5272978aa23090cc35aaad/12817523567.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/sowejiluwezulasoleduzunut.pdfIn PDF document text
    • http://sdds.be/userfiles/file/19117807262.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c5420b6b1---27701692126.pdfIn PDF document text
    • https://artenika.pl/fck/file/gewemikawizowidobodeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=carrom+disc+pool+apk+latest+versionPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE228 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3A 17048 bytes
SHA-256: 35c5ca64ec6d5e01778c953a2f8a91b5dfcddf74a6549212996791803d4d1f59
font_02_sfnt_off00012671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12671 16484 bytes
SHA-256: 64794009602ac6320d6f342430cb293439fbf1283c26b0c70b0cabe2bef15953
font_03_sfnt_off00013d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D05 10864 bytes
SHA-256: e99ab1ac275b0e54ebe9e378446c1c04975abd40352263d647a65c634da1354e

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